• ARCHITECT: unknown
• BUILT: 1216
• ADDRESS: Parroquia de Castrelos

This is one of the three best conserved Romanic churches in Vigo, along with Santiago de Bembrive and San Salvador de Corujo.

The building has a single nave with a semicircular apse, which measures twenty metres in length by seven in width. The walls are plain and not buttressed, except for the apse that separates the straight and semicircular part. There are five windows in the nave: two on the north wall, two on the south and one on the west wall. Light in the apse comes from three openings arranged symmetrically in the semicircular part.

There are two doors, one on each panel of the nave, with four and six columns respectively. The entrance to the apse from the nave is through a pointed arch. The straight part of the apse is divided by a barrel vault which in turn supports a pointed vault. Above the semicircular part there is a quadripartite vault (also known as an oven vault). A continuous bench runs along the whole apse and it supports the bases of the columns.